| 摘要 |
PURPOSE:To provide a permanent magnet having higher level of orientation than other permanent magnets manufactured by conventional powder metallurgy, by using at least one of olein and oleic acid compounds as a lubricant acting on rare earth-iron-boron alloy powder. CONSTITUTION:A lubricant and an organic solvent are mixed uniformly in rare earth-iron-boron alloy powder. The powder mixture is molded, sintered and aged within magnetic field, The lubricant used in the molding process performed within magnetic field is selected so as to improve principally the flowability and orientation properties of the powder, while the solvent is selected so as to cause the lubricant to disperse uniformly and to help it to act more effectively on the powder. By using an oleic acid or an oleic acid compound as such lubricant, friction among particles during the molding process of the alloy powder can be decreased remarkably and the orientation properties thereof can be improved. |
